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Configuration Guide - IP Service
S1720, S2700, S5700, and S6720 V200R011C10

This document describes the configurations of IP Service, including IP address, ARP, DHCP, DHCP policy VLAN, DNS, mDNS gateway, mDNS relay, UDP Helper, IP performance optimization, IPv6, DHCPv6, IPv6 DNS, IPv6 over IPv4 tunnel, and IPv4 over IPv6 tunnel.

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(Optional) Configuring a Secondary IP Address for an Interface

(Optional) Configuring a Secondary IP Address for an Interface


Generally, an interface needs only a primary IP address. In some scenarios, you need to configure secondary IP addresses for an interface. For example, a switch connects to a physical network through an interface, and hosts on this network belong to two network segments. To enable the switch to communicate with all hosts on the physical network, configure a primary IP address and a secondary IP address for this interface. You can configure multiple IP addresses for a Layer 3 interface on a switch, one as the primary IP address, and the others as secondary IP addresses. Each Layer 3 interface can have a maximum of 31 secondary IP addresses.


  1. Run system-view

    The system view is displayed.

  2. Run interface interface-type interface-number[.subinterface-number]

    The interface view or sub-interface view is displayed.

    • Only the S6720EI, S6720S-EI, S5720HI, and S5720EI support Ethernet sub-interfaces.

    • Only hybrid and trunk interfaces on the preceding switches support Ethernet sub-interface configuration.
    • After you run the undo portswitch command to switch Layer 2 interfaces on the preceding series of switches into Layer 3 interfaces, you can configure Ethernet sub-interfaces on the interfaces.

    • After an interface is added to an Eth-Trunk, sub-interfaces cannot be configured on the interface.

    • VLAN termination sub-interfaces cannot be created on a VCMP client.

  3. (Optional) On an Ethernet interface, run undo portswitch

    The interface is switched to Layer 3 mode.

    By default, an Ethernet interface works in Layer 2 mode.

    Only the S5720HI, S5720EI, S6720EI, and S6720S-EI support switching between Layer 2 and Layer 3 modes.

  4. Run ip address ip-address { mask | mask-length } sub

    A secondary IP address is configured for the interface.

    By default, no secondary IP address is configured for an interface.

Updated: 2020-02-26

Document ID: EDOC1000178170

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